请注意，如果PATHNAME本身包含无效字符，则结果经常是由平台定义的。

Note that if the PATHNAME itself consists of invalid characters, the result is often platform defined.

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如果由服务器发出，则响应消息作为字符lob (CLOB)返回。

A response message is returned as character LOB (CLOB) if issued by the server.

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没有得到匹配的字符则被悄悄忽略掉。

Unmatched characters are silently ignored.

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